Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fadcf38c3779158…

MALICIOUS

PDF

43.7 KB Created: 2020-08-25 17:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c5052653a64162bfaf98025c690c71c SHA-1: c1ca1b05d58f2d850948f0e03e2e9b67463dc3d8 SHA-256: 7fadcf38c377915838b88b40062266ad927eefdc27a0dc6e3c87978ecd18a819
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm of numerous PDF files hosted on various domains, with one primary link identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and several benign-looking PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content through a network of seemingly legitimate files. No scripts were extracted, but the presence of a malicious redirector and a large number of external links points to a content-driven attack, likely for SEO poisoning or traffic generation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=new+south+comedy+movie+2018++mp4
    • http://files.harperkinetics.com/uploads/1/3/0/8/130814623/7052710.pdf
    • http://mifodu.significanthealing.com/uploads/1/3/2/6/132682646/af862553762e.pdf
    • http://keziken.nakomaplumas.com/uploads/1/3/1/6/131606758/vajatawakumivogamali.pdf
    • http://falade.eibenteaching.com/uploads/1/3/2/6/132682974/dujakubatir-rawemeso-sawula.pdf
    • http://files.kimberly-andrews.com/uploads/1/3/2/6/132682701/judik-pagaxab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/12906046584.pdf
    • https://cdn.shopify.com/s/files/1/0427/9202/6271/files/97263670313.pdf
    • https://cdn.shopify.com/s/files/1/0433/7647/6311/files/29541447985.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8059/files/arrivederci_roma_sheet_music_piano.pdf
    • https://cdn.shopify.com/s/files/1/0435/1950/8634/files/27986412427.pdf
    • https://cdn.shopify.com/s/files/1/0435/1705/1048/files/960_fps_camera_android.pdf
    • https://cdn.shopify.com/s/files/1/0429/9823/5289/files/lotidekojexegolosedapop.pdf
    • https://cdn.shopify.com/s/files/1/0430/9726/0192/files/airway_management.pdf
    • https://cdn.shopify.com/s/files/1/0439/1564/1000/files/41727201698.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8063/files/dulupewoluzatokofakivub.pdf
    • https://cdn.shopify.com/s/files/1/0450/2241/2958/files/nowomozesozabox.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006157.bin
e90dc1d40dd49125e2e8893d6724b5be03e674142021f89d8c8cfd90d635cd2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6157 5808 bytes
font_01_sfnt_off00007539.bin
4d0e7ff67d030fa71be27e1f10f62f7f67cca36821fbdf728bb6582cf20861e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7539 14256 bytes

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